No Open Voids – O’Reilly hollowcore floors have solid ends; this eliminates the risk of water or other contamination in cores

No Additional Work on site is required to close open cores no drilling and cutting – all service openings can be easily formed in hollowcore floor slabs at production stage; slabs are manufactured up to exact site dimensions

O’Reilly pre-stressed Hollowcore floor units have better thermal properties than slabs with open hollow voids due to completely closed cores filled with polystyrene. The air movement in traditional hollowcore slabs reduces their thermal performance.

Here is a comparison of U-value between our standard Hollowcore slabs and the same slabs with open voids; lover U-value means better thermal insulation:

Slab Depth

U-value

U-value

for O’Reilly standard Hollowcore slab

for the same slab with open voids

150 mm Hollowcore

1.719

2.449

200 mm Hollowcore

1.481

2.003

250 mm Hollowcore

1.317

1.722

300 mm Hollowcore

1.192

1.522

The thermal performance of standard O’Reilly Hollowcore floor slabs is 25% better in average comparing to the same slabs with open voids